fix(husky): pre-commit hook not working for new projects

[asdolo]

What does this do?

1. This PR fixes the pre-commit hook to work with new repositories, i.e. when a new project is created from the CLI and a developer tries to create an initial commit. The issue was being caused by the command that is responsible of retrieving the current branch name. Replacing it with git branch --show-current solved the issue.
2. This PR also addresses a warning from husky v9, removing deprecated code.

Why did you do this?

1. git rev-parse --abbrev-ref HEAD doesn't work for new repositories:

$ mkdir new-project

$ cd new-project

$ git init .
Initialized empty Git repository in /Users/asdolo/dev/new-project/.git/

$ git rev-parse --abbrev-ref HEAD
HEAD
fatal: ambiguous argument 'HEAD': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'

However git branch --show-current does work:

$ mkdir new-project

$ cd new-project

$ git init .
Initialized empty Git repository in /Users/asdolo/dev/new-project/.git/

$ git branch --show-current
main

2. Because now every time pre-commit and commit-msg hooks are executed, they show the following warning message:

husky - DEPRECATED

Please remove the following two lines from .husky/pre-commit:

#!/usr/bin/env sh
. "$(dirname -- "$0")/_/husky.sh"

They WILL FAIL in v10.0.0

Who/what does this impact?

New and current users of the template.

How did you test this?

1. Locally running the CLI to create a new project. Then trying to do an initial commit successfully.
2. Verifying that the warning doesn't show up anymore.

[github-actions]

💯 Test Coverage

Lines	Statements	Branches	Functions
	50.6% (253/500)	46.63% (104/223)	36.12% (69/191)

😎 Tests Results

Tests	Skipped	Failures	Errors	Time
68	0 💤	0 ❌	0 🔥	27.311s ⏱️

👀 Tests Details • (51%)

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	50.6	46.63	36.12	51.57

report-only-changed-files is enabled. No files were changed in this commit :)